Unless the Tomb of the Moon has changed, or there's a new tactic for it that I'm not familiar with, it still requires 2 tanks and a healer, each tanking. 1 Tank for the boss, 1 tank for the black bride, 1 healer for the yellow bride. Now it's been some time since I've been in there, and that's just the way we'd always done it. Would be cool to see a new tactic (or maybe the fight's changed?) that only needs 1 tank and an off.
Anyhow, the healer doesn't need to be a WP if you're doing the old method with 2 tanks, I've done it easily with my RP, and I've been through there with an AM doing the off-tanking as well. In fact, it should be even easier to OT it after the patch if your healer is stacking Hardy Concession (and if they're not... oops?).
If I'm around when ya'll are doing this, and not completely tunnel-visioned on killing other players at the time, I've got a Rune Priest, Engi and IB who are all geared for these runs. And I like doing them, cause they're alot of fun. So holler at me if you need another when you get it together, I'm central time, and usually around after 4pm on weekdays (or all day if it's nasty outside).